A plant's height was measured to be 1 in after having been planted for 2 weeks. I...

Question

A plant's height was measured to be 1 in after having been planted for 2 weeks. It was then measured in 3 day intervals: 1.5 in, 2.1 in, 2.6 in, 3.1 in, 3.8 in. Estimate the plant height 5 weeks after planting. (in inches)

 

I keep getting values either too small or too large. I would like to know how to get the answer(it is 4.83*10), and to know if there is a specific formula for this. 

Answer 1

Hi Jason,

If you plot the height of the plant against the number of days it has been growing, you should get a relatively linear plot. Adding a trendline will give you a line with the equation y = 0.1838x - 1.6019 where x is the number of days the plant has been growing and y is the height. If you then plug in 35days for x and solve for y, you should get 4.83inches.